Carbureter



H. C. PUSEY.

CARBURETER.

APPLICATION FILED JULY I6. 1919.

1,37 8,055. Patented May 1921.

y @Wm HOWARD CARROLL PUSEY, 0F SWARTHMORE, PENNSYLVANIA.

CARBURETER.

Specification of Letters Patent.

Patented May 17, 1921.

Application led July 16, 1919. Serial No. 311,275.

To all whom t may concern:

Be it known that I, HOWARD CARROLL PUSEY, a citizen of the United States, residin at Swarthmore, county of Delaware, and tate of Pennsylvania, have invented a new and useful Improvement in Carbureters, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to carbureters for internal combustion engines.

One object of my invention is to provide a carbureter of simple construction which will thoroughly break up and mix the fuel and which will correct for fuel inertia and sudden changes of throttle.

A further object of my invention is to provide acarbureter which will have the highest possible vacuum and the greatest possible air velocity under all condltlons 'of engine operation.

A further object of my invention 1s to provide a carbureter, having a resiliently actuated choke valve which will substantially automatically control the admission of air, for starting and running with a cold motor, so that a uniform rich mixture will be supplied.

I will now proceed to describe my invention in detail in connection with the accompanying drawings, in which I have illustrated a preferred embodiment thereof and in which like symbols refer to like parts in Figure l is a side elevation of the carbureter associated with an engine manifold and connections.

Fig. 2 is a cross-sectional view illustrating the detailed construction of the carbureter.

Within the casing a is provided a float chamber b connected with a suitable source of fuel supply. In the fioat chamber is a needle valve c, controlled in a conventional inlet g in which is mounted a butteriiy valve z', pivoted, ofi'l center, to the casing and of a size less than that of the inside of the inlet passage. An arm 7c extends between the valve and one end of a spring Z, the other end of which is connected to a lever m, pivy oted to a support n and connected to a suitable hand lever o through link p.

In the body of the carbureter L is located a Ifuel well 7- closed at the bottom by a threaded plug s and connected with the iioat chamber by a passage tl Within the well is a plunger a with an emulsion chamber therein, and having on one side a rack c and adapted to be raised and lowered by the action of a p1n1on w rotatable inthe casing. An arm 9 is connected at one end to the pinion and at the other. end to suitable dash control mechanism, not shown. The plunger is provided with a head w, having radial outlets S, said; head being adapted, when the plunger is in its upper position, to close the inlet end of the venturi y positioned in the mixing chamber e. v

A tube 2, having a spray nozzle 3 at its upper end, extends within the hollow plunger u, and is arranged to constantly feed fuel to the emulsion chamber above the tube.

' 4 and 5 are longitudinal grooves in oppositel sides of the periphery of the plunger u, the groove 4 being in communication with the. emulsion chamber by means of an opening 6, while the groove 5 is in communication with the well r through opening 7 and the emulsion chamber through openings 11. As the diameter of the plunger u is the same as the bore of the well r, no fuel will pass from groove 5 to groove 4, so thatairwill be constantly supplied to the emulsion chamber through the groove 4 and opening 6, while fuel is fed to the groove 5 through opening 7, which is delivered to the emulsion chamber through openings 11 when the plunger is lowered.

These openings 11 are arranged to feed either fuel or air to the emulsion chamber, the feed being controlled by the position of the plunger. The level of the fuel inthe fuel chamber is slightly below the top of the well. When it is desired to permit the engine to run idle, the parts are in the position shown in the drawings, sothat a constant amount of fuel is fed through the nozzle 3 and a constant amount of air through opening 6 and all of the openings 11, which will feed a correct mixture without any further mixture of air in the mixing chamber.

When it is desired to speed up the engine or obtain increased power, the pinion is rotated by its actuating mechanism and the vbutteriy valve is opened. The lowering of the plunger will determine the size of the air opening from the intake to the mixing chamber z and as soon as t e plunger is lowered to any appreciable extent, the air supply to the emulsion chamber will be reduced, as one or more of the openings 11 will be submerged in the fuel. This vsubmerging of the openings 11 will reduce the amount of air fed to the emulsion chamber and increase the amount of fuel fed thereto, to increase the richness of the emulsion, which is mixed with further air in the mixing chamber a. The richness of the emulsion is gradually increased as the plunger is lowered, which lowering of the plunger gradually increases the feed of air to the mixing chamber between the venturi and the head of the plunger.

When a rich mixture isdesired for start' ing or running a cold motor, lever o is raised, thus permitting spring Z to close the butterfly valve z'. When the motor starts the excess vacuum, which would be present in an ordinary type of choke valve and which would result in anv over-rich mixture, is relieved by the resilient action of the butterfiy valve, which, being unbalanced, will open against the tension of the spring in proportion to the degree of vacuum, admitting more air and creating a uniformly rich Amixture for starting and running with a cold motor. When the motor is heated up, the lever ois lowered and the butteriiy valve will open by gravity and air pressure.

The parts are so proportioned as to provide for the exact mixture for every engine speed.

The pump-like action of plunger in the well 1- wi'll compensate for the fuel lag in a quickly opened throttle and for an excess iiow of fuel with a suddenlyl closed throttle.

Having now fully described my invention, what I claim and desire to protect by Letters Patent is:

1. A carbureter having a mixing chamber, an air inlet communicating with the mixing chamber, a constant level chamber, a well in communication with the constant level chamber, ahollow plunger extending from the well into the mixing chamber and having an emulsion chamber therein communicating with the mixing chamber, there being ing a plurality .plunger for increasing the fuel fed a calibrated opening for constantly feeding fuel to said emulsion chamber, a constant air supply for the emulsion chamber, means for lowering the hollow plunger, means for .increasing the air supply to the mixing when the plunger is lowered, and

chamber other means for feeding fuel, and air to the emulsion chamber, said means being arranged to decrease the air supply and increase the fuel supply as the main air supply is increased.

2. A carbureter having a mixing chamber, an air inlet communicating with the mixing chamber, a constant level chamber, a well in communication with the constant level chamber, a hollow plunger extending from the well into the mixing chamber and lhaving an emulsion chamber therein communieating with the mixing chamber, there beof openings through the wall of the plunger arranged to be successively moved into the well as the plunger is lowered, said openings being arranged to feed either fuel or air to the emulsion chamber, said feed being determined on the position of the plunger, and means .for lowering the plunger, the upper end of said plunger being arranged to increase the air supply to the mixing chamber when it is lowered.

'3. A carbureter having a iioat chamber, a fuel well in communication with said float chamber, an air inlet, a mixing chamber in communication with the air inlet, a plunger movable within the well, a Venturi tube in the mixing chamber, there beinkl an emulsion -chamber within the plunger, openings through the wall of the plungerf arrangedto communicate either with the air chamber in ,the carbureter or the well, a valve head on the upper end of the plunger, there' being openings through said head in communication with the emulsion chamber and also opening to the mixing chamber, and means for raising and lowering the to the emulsion chamber, and, at the same time, increasing the amount of air fed to the mixing chamber.

In testimony of which invention;` I have hereunto set my hand, at Philadelphia, Penn., on this 26th day of June, 1919.

HOWARD CARROLL PUSEY. 

